Answer
$12 + 7i\sqrt{5}$
Work Step by Step
Regroup then simplify by combining like terms to obtain
$=(4+8) + (i\sqrt{5}+6i\sqrt{5})
\\= 12 + (i+6i)\sqrt{5}
\\=12 + 7i\sqrt{5}$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 570: 32
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